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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
#define WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
#include <map>
#include "base/basictypes.h"
#include "base/file_path.h"
#include "base/memory/ref_counted.h"
#include "webkit/storage/webkit_storage_export.h"
class GURL;
namespace dom_storage {
class DomStorageArea;
class DomStorageTaskRunner;
class SessionStorageDatabase;
// Container for the set of per-origin Areas.
// See class comments for DomStorageContext for a larger overview.
class WEBKIT_STORAGE_EXPORT DomStorageNamespace
: public base::RefCountedThreadSafe<DomStorageNamespace> {
public:
// Constructor for a LocalStorage namespace with id of 0
// and an optional backing directory on disk.
DomStorageNamespace(const base::FilePath& directory, // may be empty
DomStorageTaskRunner* task_runner);
// Constructor for a SessionStorage namespace with a non-zero id and an
// optional backing on disk via |session_storage_database| (may be NULL).
DomStorageNamespace(int64 namespace_id,
const std::string& persistent_namespace_id,
SessionStorageDatabase* session_storage_database,
DomStorageTaskRunner* task_runner);
int64 namespace_id() const { return namespace_id_; }
const std::string& persistent_namespace_id() const {
return persistent_namespace_id_;
}
// Returns the storage area for the given origin,
// creating instance if needed. Each call to open
// must be balanced with a call to CloseStorageArea.
DomStorageArea* OpenStorageArea(const GURL& origin);
void CloseStorageArea(DomStorageArea* area);
// Returns the area for |origin| if it's open, otherwise NULL.
DomStorageArea* GetOpenStorageArea(const GURL& origin);
// Creates a clone of |this| namespace including
// shallow copies of all contained areas.
// Should only be called for session storage namespaces.
DomStorageNamespace* Clone(int64 clone_namespace_id,
const std::string& clone_persistent_namespace_id);
void DeleteLocalStorageOrigin(const GURL& origin);
void DeleteSessionStorageOrigin(const GURL& origin);
void PurgeMemory();
void Shutdown();
private:
friend class base::RefCountedThreadSafe<DomStorageNamespace>;
// Struct to hold references to our contained areas and
// to keep track of how many tabs have a given area open.
struct AreaHolder {
scoped_refptr<DomStorageArea> area_;
int open_count_;
AreaHolder();
AreaHolder(DomStorageArea* area, int count);
~AreaHolder();
};
typedef std::map<GURL, AreaHolder> AreaMap;
~DomStorageNamespace();
// Returns a pointer to the area holder in our map or NULL.
AreaHolder* GetAreaHolder(const GURL& origin);
int64 namespace_id_;
std::string persistent_namespace_id_;
base::FilePath directory_;
AreaMap areas_;
scoped_refptr<DomStorageTaskRunner> task_runner_;
scoped_refptr<SessionStorageDatabase> session_storage_database_;
};
} // namespace dom_storage
#endif // WEBKIT_DOM_STORAGE_DOM_STORAGE_NAMESPACE_H_
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